const chars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];

/**
 * 随机生成指定长度的字符串
 */
const random = function (n) {
  var res = ""
  for (var i=0; i < n; i++) {
    var id = Math.ceil(Math.random() * 35)
    res += chars[id]
  }
  return res;
}

/**
 * 将请求函数转换成promise函数
 */
const promisic = function(func) {
  return function(params = {}) {
    return new Promise((resolve, reject) => {
      const args = Object.assign(params, {
        success:(res) => {
          resolve(res)
        },
        fail: (error) => {
          reject(error)
        }
      })
      func(args)
    })
  }
}

export { random, promisic }